Alternating-current relay



E. J. BLAKE. ALTERNATING CURRENT RELAY.

APPLICATION FILED APR. I9. I9II.

1,833,051. Patented Mar. 9,1920.

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ATTORNEYS E. J. BLAKE.

ALTERNATING CURRENT RELAY.

APPLICATION FILED APR.19. 1917. 1,338,058, Patented Mar. 9, 1920.

3 SHEETS-SHEET 2.

INVENTOR Z2. @Z w;

ATTORNEYS -E. J. BLAKE.

ALTERNATING CURRENT RELAY.

APPLICAHON FILED APR.I9, 1911.

Patented Mar. 9, 1920.

3 SHEETS-SHEET 3.

? INVENTOR *A/fiZa/a.

ATTORNEYS UNITED STATES PATENT OFFICE.

ELI J. BLAKE, OF WESTFIELD NEW JERSEY, ASSIGNOR TO HALL SWITCH 6; SIGNAL (10.,

A CORPORATION OF MAINE.

ALTEBNATING-CURRENT RELAY.

Specification of Letters Patent.

Application filed April 19, 1917. Serial No. 163,222.

To all whom it may concern Be it known that I, ELI J. BLAKE, a citizen of the United States, and a resident of the town of Westfield, county of Union, and State of New Jersey, have invented certain new and useful Improvements in Alternating-Current Relays, of which the following is a specification.

My invention relates to certain new and useful improvements in alternating current relays, more specifically of the type known as induction motor relays which operate on the induction motor principle having a nonmagnetic cup rotor acted upon by a shifting field to cause the cup to rotate and operate the relay.

One object of my invention is to provide a highly efiicient form of winding for the operating element of this particular type of apparatus.-

Other objects will be more specifically described in the accompanying specification and appended claims.

Figure 1 is a transverse section through a relay employing my invention.-

Fig. 2 is a, front elevation of the same relay.

F 1g. 3 is a front elevation of the operating motor of the relay with the front removed.

Fig. 4 is a rear elevation of the front part of the relay showing the pinion and sector operating mechanism.

Fig. 5 is a winding diagram showing my invention, and Fig. 6 is a perspective sketch ofpne possible arrangement of form wound 001 s. V

Referring to Fig. 1, I show a front member 1 to which is attached a case 2 having an internal annular support 3 formed therein, upon which is mounted a soft iron laminated ring shaped core 4. About the core 4 is a multipolar laminated field structure 5 which is provided with operating windings 6 and 7 so angularly disposed that when they are energized by means of two phase alternating current it will create a moving flux field between the pole pieces 8 and the core 4 in the well known manner of an induction motor. In the annular space formed between the core 4 and the pole pieces 8 of the laminated field structure 5, a non-magnetic cup rotor 9 is rotably mounted on a spindle 10 journaled in bearings 11 and 12. The cup 9 being freely mounted on the spindle 10 and clamped between friction washers 13 and 14 by means of a compression spring 15- acting between the retainer ring 16 and the friction washer 14. It will therefore be seen, that the cup 9 will be free to rotate in the annular space between the core 4 and the pole pieces 8 and will be free to slip upon the shaft 10 upon any undue torque being placed upon the cup. On the front end of the shaft 10 a pinion 17 is rigidly mounted, and sector 18 mounted rotatably at a point 19 meshes with the pinion 17, being counter-weighted at 59 so that it will normally assume the position shown in Fig. 4 with the projection 20 resting against the inside wall 21 of member 1.

Sector 18 is provided with a crank pin 22 so arranged that upon the movement of sector 18 by means of rotation of pinion 17 acting against the counterweight 59 the connecting link 23 will be forced downward. The link 23 is connected by means of a fulcrum pin 24 to a lever arm 25 which operates about a center 26 and attached to the lever arm 25 is the contact finger carrying bar 27 made of insulating material, on the underside of which are mounted contact fingers 28.

Thus it will be seen that the contact fingers are controlled indirectly by the energization and deenergization of the motor windings 6 and 7. In the normal operation of the relay one phase is constantly energized and the relay is controlled by opening or closing the circuit to the other phase in any well known manner.

The preferred arrangement of stator wind ings is shown in diagrammatic development in Fig. 5. In the example chosen the wind- Patented Mar. 9, 1920.

ing consists of two phases each wound for four poles. The. winding for each pole of each phase consists of three concentric coils. For example, the winding for the first pole at the left in the diagram consists of three coils lying respectively in slots 3 and 5, 2 and 6, and 1 and 7. The coils of the adjoining pole of the other phase lie in slots 6 and 8, 5 and 9, and 4 and 10, overlapping the coils of the first hase. Slots Nos. 1, 4, 7, 10, etc., each contain two coil sides of the same phase while slots 2, 3, 5, 6, 8, 9, 11, 12 each contain two coil sides of different phases; so that the winding of each phase is distributed over a large number of slots,

iving a low value of reactance which is the desirable feature of theordinary lap winding. The latter type of winding is not desirable in signal relays required to act only when both phases are energized, because a short circuited coil in one phase may act as a shading coil excited inductively from the other phase, and may thus produce a shifting field which will cause the rotor to revolve when only one phase is energized. In the Winding illustrated every coil of each phase is centered midway between the poles v of the other phase so that no current can be induced in it even though it be short circuited. In the diagram the coils of each polar group are shown connected in series, While the groups of one phase are connected in multiple, but this arrangement is not essential. Energy from the transmission line is supplied to one phase through a transformer 31 and to the other phase through a transformer 32 and a contact 33. The latter phase is understood to be wound with Wire of relatively high resistance so that its current will lead the current of the former phase, and cause the rotor to revolve.

- But it is evident that the same result may be obtained if the two phases are fed through circuits of difierent characteristics, as, for example when one phase is fed directly from its transformer while the other phase is fed through a track circuit.

Fig. 6 shows in perspective the coils of one polar group removedfrom the stator, with the ends of the coils taped together.

What I claim as new is:

1. A relay of the induction motor type having primary windings disposed in two circuits the coils of each circuit being arranged in concentric groups, with coil sides laid in two layers in the slots, each coil having ,one side in the inner layer and one side in the outer layer, with the polar windings of one circuit overlapping those of the other I circuit and displaced therefrom by 90 electrical degrees.

2. A winding for two-phase induction motor relay stators comprising polar groups of coils, the coils in each group being laid concentrically while successive groups are lap laid and displaced 90 electrical degrees; whereby every coil of each phase is rendered non-inductive with respect to the other phase, as in concentrated windings, While the winding is sub-divided into aqlarge number of coils giving low reactance as in distributed windings.

In testimony whereof I have signed my name to this specification.

ELI J BLAKE. 

